WO2013182573A1

WO2013182573A1 - Lighting module having light sources spaced apart, for implementing an abd function

Info

Publication number: WO2013182573A1
Application number: PCT/EP2013/061510
Authority: WO
Inventors: Pierre Albou; Marine Courcier; Vanesa Sanchez
Original assignee: Valeo Vision
Priority date: 2012-06-04
Filing date: 2013-06-04
Publication date: 2013-12-12
Also published as: FR2991251B1; FR2991251A1; JP2015519002A; EP2856009B1; EP2856009A1; JP6345653B2

Abstract

The invention concerns a lighting module (1) for a motor vehicle headlight capable of generating a light beam (7) with an optical axis (2), comprising at least one first light source (8) and one second light source (9) spaced apart from one another by a distance D, said light sources (8, 9) each being capable of generating a light strip (5, 6) spaced apart one from the other by a strip (11) not illuminated by the lighting module, said light sources (8, 9) being defined by a same dimension L measured perpendicular to the optical axis (2), characterised by the fact that distance D between two immediately adjacent light sources (8, 9) is strictly greater than N*L and strictly less than (N+1)*L, N being a whole number. The invention also concerns a headlight incorporating a plurality of such lighting modules, and a lighting system comprising two headlights. Application to motor vehicles.

Description

LIGHTING MODULE WITH LUMINOUS SOURCES REMOVED, FOR USE

IMPLEMENTATION OF AN ADB FUNCTION

The technical sector of the present invention is that of devices or means 5 lighting and / or signaling for a motor vehicle.

There is a need, in the field of the automobile, to be able to illuminate the road taken by a vehicle in a "partial road lighting mode", namely to generate in a road beam one or more dark beaches corresponding to o where are present oncoming vehicles or vehicles traveling in the same direction, so as to avoid dazzling the occupants of these vehicles, while illuminating the road in its larger area. Such a function is called ADB (Adaptive Driving Beam, in English).

It is known to generate this function by arranging a plurality of light sources in front of an optical projection system, for example a lens, and by controlling the switching on or off of these sources. However, this technical solution reveals unlit strips between each light band created by the light sources. Such a defect results from the fact that these sources

20 luminous can not be fully joined next to each other, the technology used for these sources imposing a minimum distance between each source.

EP2280215A2 discloses a lighting module for a motor vehicle fulfilling the ADB function. It comprises a plurality of light emitters, each light emitter being associated with a dedicated light guide and a lens, so as to generate a plurality of light strips.

This lighting module of the prior art has several disadvantages.

30

In the first place, the use of a lightguide assigned to each light emitter significantly increases the cost of the function and thus prevents its implantation on mid-range and low-end vehicles.

Moreover, the use of a light guide generates photometric losses that can reach 25% of the photometric power emitted by the light emitter.

If the light guides are suppressed and limited to the affordable medium power components (2 to 5W), the lighting module disclosed in this prior art document requires the use of a single transmitter. o bright available on the market so far. It is therefore a light emitter which has rare and particular characteristics, especially as regards its shape. Such a light emitter thus constitutes a component that has a non-compatible availability for its use in the automotive sector.

15

The object of the present invention is therefore to solve the disadvantages described above mainly by providing a lighting module capable of generating the ADB function by means of simple components widely available on the market, the light beam generated being otherwise homogeneous.

20

The subject of the invention is therefore a lighting module for a motor vehicle headlamp capable of generating a light beam along an optical axis, comprising at least a first light source and a second light source spaced from each other by a light source. distance D, said sources

25 luminaires each being capable of generating a luminous band spaced apart from each other by a strip not illuminated by the lighting module, said light sources being defined by the same dimension L measured perpendicularly to the optical axis, characterized by the fact that the distance D between two immediately adjacent light sources is strictly greater than

N ^* L and strictly less than (N + 1) ^* L, N being an integer.

According to an exemplary embodiment, the distance D between two sources luminous immediately adjacent is strictly greater than (N + 0,25) ^* L and strictly less than (N + 0,75) ^* L.

According to a more specific exemplary embodiment, the distance D between two immediately adjacent light sources is equal to (N + 0.5) ^* L.

Note that the result of the mathematical formulas above can be weighted due to manufacturing tolerances, including the light source and its electrical connection support, for example a printed circuit board.

Thus, the angular width of the unlit strip is equal to 1.5 times the width of one of the light bands, these widths being measured in a horizontal plane containing the optical axis. By angular width is meant an angular sector corresponding to the unlit strip.

The light sources can be secured on the same support. Alternatively, the light sources can be made integral with separate supports.

20

The lighting module may comprise at least one reflection means and a projection device common to said light sources which participate in the formation of a first light band generated by the first light source and in the formation of a second light band generated. by the second light source. Such a structure makes it possible to rationalize the number of components necessary to carry out the lighting function, which makes it possible to reduce the bulk of the lighting module and to facilitate its implementation.

According to an exemplary embodiment, the reflection means takes the form of a single reflector which reflects a first light beam generator of the first light strip and a second light beam generator of the second light strip. The projection device may for example be formed by a single focusing device, in particular a lens, which focuses the first light beam and the second light beam, and advantageously all the light beams generated by the lighting module.

The light sources are advantageously electroluminescent diodes. In a particular example, the lighting module according to the invention comprises an odd number of light sources, for example three or five light sources.

The invention also relates to a motor vehicle headlight 15 comprising at least one lighting module as described above.

In a complementary manner, the projector according to the invention comprises an odd number of lighting modules, such a number nevertheless being greater than one.

20

According to one embodiment, the number of lighting modules is odd and equal to 2N + 3, N being the integer previously seen and defining the angular width of the dark bands of the beam of a module.

In a particular example, the projector comprises three lighting modules. Such a solution is interesting because it allows to implement the ADB function while remaining in a limited space and compatible with its implementation in the projector. In such a case, each module may comprise five light sources spaced 0.5 times the width of a

30 light source, which allows to form a projector lighting beam comprising fifteen light bands, or thirty light strips for a lighting system comprising a front left projector and a projector Before right. It is understood here that the resolution of the ADB function is particularly high, which improves this function.

According to an exemplary embodiment, the projector comprises at least a first lighting module, a second lighting module and a third lighting module, the second lighting module being arranged in the projector so as to generate strips. secondary illuminated angularly offset from the primary light bands generated by the first illumination module, the third illumination module being arranged in the projector so as to generate tertiary light bands angularly offset from the primary and secondary light bands . Such an offset is in particular made by rotation around a substantially vertical axis.

According to one example, the angular offset between the first lighting module 15 and the second lighting module, and between the second lighting module and the third lighting module, is equal to ½ width of a light band generated. by the first lighting module, measured in a horizontal plane containing the optical axis.

The overlap of light bands resulting from the evoked offset, combined with the distance D between two immediately adjacent light sources, ensures a resultant illumination beam without a dark band, when the ADB function is not activated.

According to one embodiment, the projector comprises an odd number greater than one of lighting modules according to the invention, for example three lighting modules; the projector comprising at least a first lighting module, a second lighting module and a third lighting module; the second lighting module being arranged in the projector so as to

Generating secondary light bands angularly offset from the primary light bands generated by the first lighting module, the third lighting module being arranged in the projector so as to generating tertiary light bands angularly offset from the primary and secondary light bands; the first lighting module and the third lighting module forming a first plane, the second lighting module forming a second plane distinct from the foreground; the angular offset between the first lighting module and the second lighting module, and between the second lighting module and the third lighting module being possibly equal to ½ width of a light band generated by the first module of illumination lighting, measured perpendicular to the optical axis.

According to one embodiment making it possible to obtain better results in terms of homogeneity, the modules are transversely as close as possible, and in particular when these modules generate light bands adjacent to infinity. By transversely, we mean along a horizontal axis perpendicular to the optical axis of the projector. The optimal arrangement is a vertical stack of all the modules exactly superimposed, since in this case the modules are not shifted transversely.

The modules may have a linear offset towards the rear of the projector, depending on the direction of emission of the light beams.

In a particular example, the projector may comprise five lighting modules. In this situation, each module may comprise three light sources aligned but spaced 1 .5 times the width of a light source.

According to an application example, the lighting modules participate in the formation of a road light beam. The invention also covers a lighting system for a motor vehicle comprising a first projector and a second projector, both as described above, the first projector projecting a first network. light bands generated by a plurality of lighting modules, the second projector projecting a second light band array generated by a plurality of lighting modules, the plurality of lighting modules of the second projector being arranged to shift in a horizontal plane the second network of light bands with respect to the first network of light bands of a quarter width of the first light band generated by a first lighting module installed in the first projector, measured in the horizontal plane. Such an organization multiplies the overlap of light bands, which tends to homogenize the resulting beam of illumination and makes it possible to increase the resolution of the ADB system in the zone of the space where the beams of the left and right headlamps overlap. . Indeed, the dark bands achievable then in this zone by a judicious combination of extinction of sources of the left and right headlights may have a width equal to one quarter of that of the first band

15 generated by a first lighting module installed in the first projector. In areas where the beams do not overlap, the minimum width of the achievable dark strips is equal to half the width of the first light band generated by a first lighting module installed in the projector.

20

A first advantage according to the invention resides in the possibility of producing a homogeneous beam ADB function without resorting to the use of a light guide. The cost of the function can thus be reduced, which makes it easier to democratize the function.

25

Another advantage lies in the possibility of using a wider variety of light-emitting diodes available on the market. This limits the risk of out of stock, and the cost of this diode is less dependent on the market.

30

Another significant advantage is a good homogeneity of the resulting lighting beam, with a limited number of modules and sources bright. Visual comfort is thus improved.

Other characteristics, details and advantages of the invention will emerge more clearly on reading the description given below as an indication with reference to drawings in which:

FIG. 1 is a schematic view showing a lighting module according to the invention,

FIG. 2 is a perspective view of the components used in a lighting module according to the invention,

FIG. 3 is a schematic view of a projector incorporating three lighting modules according to the invention,

FIG. 4 is a view showing a light projection generated by a lighting system comprising two projectors according to the invention,

FIG. 5 is a perspective and front view of a projector incorporating five lighting modules according to the invention.

FIG. 1 illustrates a lighting module 1 intended to equip a motor vehicle, in particular by being installed inside a front headlight of the vehicle. This headlamp is capable of emitting one or more beams, in particular an optical axis-type beam referenced 2. The road-type beam is here implemented by the lighting module (s) 1 embedded in the headlamp.

Such a lighting module 1 participates in the implementation of a function

ADB, i.e. selective switching on and off of one or more light strips within a road-type beam, so as to avoid dazzling a crossover vehicle or vehicle, while maintaining the level of illumination of the road function on either side of the crossed vehicle or

30 followed.

This lighting module 1 ensures the provision of at least a first beam 3 and a second light beam 4, these beams each forming a luminous strip of rectangular shape, or substantially rectangular, respectively named first light strip 5 and second light strip 6. These light strips are here made visible by projection on a 5 screen perpendicular to the optical axis 2 and located for example 25 meters from the lighting module 1.

A light band is formed by a zone illuminated by the lighting module 1 which extends between two lines of contrast. The latter thus border the light strip concerned and delimit it at least in vertical directions, or substantially vertical.

The lighting module 1 is able to generate a light beam 7 which is formed by the combination of light bands generated by the lighting module 1.

The lighting module 1 according to the invention comprises at least a first light source 8 and a second light source 9. Such light sources are advantageously formed by light-emitting diodes.

20

These light sources 8, 9 can each be secured on separate supports. Alternatively and as shown in FIG. 1, the light sources are integral with the same support 10, the latter being for example a printed circuit board on which a plurality of conductive electrical tracks used to supply the light sources electrically.

Each light source 8, 9 may have a rectangular shape, for example square. In a plane parallel to the plane of extension of the support 10, these light sources are thus defined by two dimensions referenced L and A in FIG. It will be noted that these dimensions are identical for all the light sources constituting the lighting module 1. The dimension L defines the width and the dimension A defines the length of the light source considered. The width L thus extends between two parallel edges of the light source, these edges being also parallel to, or substantially parallel to, the optical axis 2. The measurement of this width L therefore takes place in a direction perpendicular to the optical axis 2 passing through the two edges.

The length A extends between two parallel edges of the light source, where these edges are advantageously perpendicular to the optical axis 2. The measurement of this length A is carried out in a direction parallel to the optical axis passing through the two edges.

In the case where the light source is a light-emitting diode 15 consisting of a base on which is fixed a light-emitting zone, the width L and the length A are determined relative to the emitting zone.

The light sources 8, 9 are arranged in the lighting module so that there is a non-zero space between two light sources 8, 9 immediately adjacent. This space is materialized by a distance referenced D in FIG. This distance D extends between two edges side by side of two adjacent light sources. In other words, the distance D extends between an edge of the first light source 8 which is immediately contiguous to an edge of the second light source 9.

25

This distance D between the first light source 8 and the second light source 9 is at the origin of an area or band unlit 1 1 located between the first light strip 5 and the second light strip 6. The width of this non-light strip 1 is measured on the screen perpendicular to the optical axis 2 and is thus determined by the distance D. This band is described as being unlit in the sense that the lighting module 1 does not project light rays towards this light. non-illuminated band 1 1. On the other hand, this non- Illuminated 1 1 can be illuminated by another lighting module, as will be detailed in the description to come with reference to Figures 3 and 4.

According to the invention, the distance D is determined by a mathematical formula connecting it directly to the width L defining the light sources, this width being identical for all light sources, with manufacturing tolerances. According to the invention, this distance D is equal to any value strictly between the width L multiplied by an integer N and the width L multiplied by the integer N plus one unit.

The term strictly means that the bounds resulting from this calculation are not within the range of values of the distance D covered by the invention. Of course, the unit of measure of the distance D and the width L are identical for example in millimeters.

As an example of application, if the width L is equal to 1 mm and the integer number N is chosen equal to 1, the distance D is between 1.01 mm and 1.99 mm. If the width L is equal to 3 mm and the integer number N is chosen equal to 1, the distance D is between 3.01 mm and 5.99 mm.

By way of example, the width L of the light source may be equal to 1.4 mm.

According to an exemplary embodiment, the distance D between two immediately adjacent light sources can be strictly greater than (N + 0.25) ^* L and strictly less than (N + 0.75) ^* L. For example, the width L is equal to 2 mm and the integer N is equal to 2, the distance D will be between 4.51 mm and 5.49 mm.

According to a particular embodiment of the invention, the distance D between two light sources immediately adjacent is equal to (N + 0.5) ^* L. To illustrate this relationship, light sources of width L equal to 1 mm and an integer N equal to 1 are chosen. In this case, the distance D is equal to 1.5 mm. Such an example is particularly suitable for a projector comprising five lighting modules 1 each comprising at least two light sources.

According to this exemplary embodiment, it is thus possible to consider that the width of the unlit strip 1 1 is equal to 1.5 times the width of the light bands referenced 5 or 6. The width of the unlit strip 1 1 corresponds to a gap 1 angularly between adjacent contiguous lines of two adjacent light bands, for example the first light strip 5 with respect to the second light strip 6. These dimensions and angular deviation can be obtained for example using a goniometer .

According to another example, if the width L is chosen equal to 1 mm and the integer number N is 0, the distance D is equal to 0.5 mm. Such an example is particularly suitable for a projector comprising three lighting modules 1 each comprising at least two light sources.

The formulas and examples set out above may be weighted to take into account the manufacturing tolerances of the light sources and the assembly tolerances of the light sources relative to one another, these assembly tolerances influencing the distance D between two sources. immediately adjacent. Similarly, because of non-linearities

As they induce between the distance D and the effective angular separation between two bands, the optical aberrations of the projection element also influence the optimum value of the distance D which can be adjusted to compensate for them.

The exemplary embodiment illustrated in FIG. 1 shows the presence of a third light source 12 of identical structure and dimensions to the first and second light sources 8, 9. It goes without saying that this third light source 12 can be placed in the lighting module 1 so as to respect the mathematical relationships or examples presented above, and we can refer to the description above to define its relative position.

This third light source 12 generates a third light beam 15 which is embodied by a third light strip 16 on the screen. An unlit area 17 is present between the first light strip 5 and the third light strip 16, the width of this unlit area 17 being dependent on the distance D which separates the third light source 12 from the first light source 8.

FIG. 1 still shows components that can complete the lighting module 1 according to the invention.

The lighting module 1 can thus comprise a reflection means 13 whose function is to collect the light rays emitted by the first light source 8, the second light source 9, and any additional light source which can for example be secured to the light source. 10. According to an exemplary embodiment, such a reflection means 13 is a reflector, for example a parabolic mirror, elliptical, complex surfaces or cylindrical horizontal axis. In the latter case, the reflector collects the light rays to form a virtual image of the light source, in the form of a band of a given height and a width equal to that of the light source.

A projection device then projects this image onto the screen at 25m, the focal length of a projection device and the width of the light source determining the width of the light band, whereas this same focal length and the height of the light source determine the height of the light band.

In addition, the reflector can be arranged so that the virtual image does not offer a luminance distribution identical to that of the light source, concentrating the beam on the lower part of the light strip. Such a structure makes it possible to obtain the desired distribution in the light bands, including a non-centered maximum and a progressive decay upwards. For a more detailed explanation, reference is made to EP2278217A, the contents of which are integrally incorporated by reference.

Thus, a single reflection means 13 makes it possible to send back the light beams emitted by the first light source 8 and by the second light source 9.

The first lighting module 1 further comprises the projection device 14 whose function is to project the first beam 3, the second beam 4 and possibly all the other beams generated by additional light sources constituting the lighting module, for example. For example, such a projection device 14 may be a focusing device. It is therefore understood that it is a single projection device which participates in the formation of several light bands, in particular the first light strip 5 and the second light strip 6. According to an example embodiment, such projection device 14 is a lens having in particular at least one convex face.

FIG. 2 shows an exemplary embodiment of the lighting module 1 according to the invention.

The support 10 is a plate or printed circuit board which receives on one and the same face the first light source 8, the second light source 9 and the third light source 12. These are rectangular-shaped light-emitting diodes. The support can also receive electronic components used for example for switching on or off these light sources in the ADB function.

Perpendicular to the plane of extension of the support 10, there can be found a shutter 18 whose function is to prevent a direct emission of the light rays generated by the light sources to the projection device 14. This shutter 18 may in particular have a reflective surface so as to return these rays to the reflection means 13.

The projection device 14 is a lens having a first face 19 which directly faces the reflection means 13. This first face 19 is here for example cylindrical, vertical axis.

The lens is delimited by a second face 20 which is opposite to the first face 19 relative to a body 21 of the lens. This second face 20 has a concave shape seen from the first face 19.

The first, second and third light beams, represented here globally by an arrow referenced 22, are emitted by the first, second and third light sources 8, 9 and 12 and strike a surface of the reflection means 13. The latter redirects them. to the projection device 14 to project on the road taken by the vehicle.

The above description made with reference to FIGS. 1 and 2 is related to the lighting module 1, but it also applies to the other lighting modules that can be embedded in the projector, the description of which begins -after.

Figure 3 shows a front projector 23 for a motor vehicle comprising at least one lighting module 1 as detailed above. In

In the example illustrated in this figure, the projector 23 comprises three distinct lighting modules of identical structure and dimensions, that is to say a first lighting module 1, a second lighting module 24 and a third Lighting module 25. In this case, each module may comprise a number of light sources greater than unity. In the example of Figure 3, each

The lighting module comprises three light sources implanted relative to one another in the manner described with reference to FIGS. 1 and 2. The combination of lighting modules contributes to the formation of a road-type lighting beam.

It goes without saying that the projector 23 according to the invention may comprise three lighting modules each comprising, for example, five light sources, the resulting beam of which will be explained with reference to FIG. 4. In such a case, the distance D between each immediately adjacent light source of the same lighting module is equal to 0.5 ^* L, L corresponding to the width of these light sources.

The invention also covers the situation where the projector 23 according to the invention can comprise five lighting modules which each comprise for example three light sources. In such a situation, the distance D between each immediately adjacent light source of the same lighting module is 1.5 ^* L, L corresponding to the width of these light sources.

In general, the projector 23 may comprise an odd number of lighting modules greater than one, each lighting module comprising a number of light sources different from the unit.

Each lighting module generates a number of light bands equal to the number of sources it contains. The first lighting module 1 is thus the generator of the first light strip 5, the second light strip 6 and the third light strip 16 of identical widths, the latter being commonly called primary light strips. The second lighting module 24 is the generator of a fourth light band 26, a fifth light band 27 and a sixth light band 28 of identical widths, the latter being commonly called secondary light bands. The third lighting module 25 is the generator of a seventh light band 29, an eighth light band 30 and a ninth light band 31 of identical widths, the latter being commonly called tertiary light bands.

The third lighting module 25 is oriented angularly with respect to the first lighting module 1 so that the tertiary light bands are offset in a direction perpendicular to the optical axis 2 relative to the primary light bands, for example a width of one of the primary light bands, in particular the first light strip 5. With respect to the second lighting module 24, the offset is equal to half a width of the first light strip 5, in the same direction.

The second lighting module 24 is oriented angularly with respect to the first lighting module 1 so that the secondary light bands are shifted in a direction perpendicular to the optical axis 2 relative to the primary light bands, for example half a width of one of the primary light bands, in particular the first light strip 5.

In general, it is understood that the offset between the first lighting module 1 and the second lighting module 24, and between the second lighting module 24 and the third lighting module 25, is equal to one half width of the first light strip 5.

The measurement of the width of the light bands and their shifting mentioned above takes place in a horizontal plane containing the optical axis 2.

It will be noted that the primary, secondary and tertiary light bands have been shown in Figure 3 in a non-aligned manner to facilitate understanding of the invention, but it goes without saying that these primary, secondary and tertiary light bands are aligned, or substantially aligned along a straight line passing through a lower edge of each of the light strips. The primary, secondary and tertiary terms used in the above description are intended to distinguish the three rows of light bands without, however, defining a hierarchy between these rows.

To limit the phenomenon of parallax between lighting modules, the invention proposes to have the lighting modules in a particular way in the projector. Thus, the first lighting module 1 and the third lighting module 25 are in a first horizontal plane, while the second lighting module 24 extends in a second horizontal plane 1 o distinct from the horizontal foreground. Here it is understood that the second lighting module 24 is arranged vertically above or below the first and third lighting modules, for example by overlapping one half of the first lighting module 1 and one half of the third lighting module. 25. This particular location has been schematically illustrated in FIG.

15 showing the second lighting module 24 behind the first and third lighting modules 1, 25.

FIG. 4 shows light strips generated by a right front searchlight and a left front searchlight on the vehicle, forming a front lighting system of said vehicle. A first network 33 of light bands is generated by the front left projector. A second network 34 of light bands is generated by the right front projector. The resulting lighting beam 35 is a superposition of the first grating 33 with the second grating 34.

25

Each of the networks here is formed by the primary light bands, the secondary light bands and the tertiary light bands. These strips are each formed by five light bands spaced apart from each other as explained with reference to FIGS. 1 and 2. These five light bands are thus generated by five light sources.

The first network 33 of light strips is off center to the left of an axis optical 36 of the vehicle. The second network 34 of light bands is in turn decentered to the right of the optical axis 36.

The first network 33 and the second network 34 are also offset relative to each other in a direction perpendicular to the optical axis 36 of the vehicle, such a direction can be confused with a horizontal axis. Such an offset can be implemented by an angular adjustment of one or the other of the front projectors. Alternatively or in a complementary manner, the lighting modules installed in one or other of the projectors may be oriented angularly to effect the desired offset.

According to an exemplary embodiment, this offset is equal to a quarter of a width of the first light band 5 generated by the first lighting module 1 installed in the first projector, measured along the direction 15 perpendicular to the axis optical 36 of the vehicle, or possibly in the horizontal axis. This offset makes it possible to generate a homogeneous resultant light beam without contrast differences when all the light sources are powered.

Of course, the switching on or off of light bands is placed under the control of a control device, one of whose functions is to implement the ADB function.

FIG. 5 illustrates an implantation of five identical lighting modules, 25 in accordance with that described with reference to FIGS. 1 and 2, in a front projector 23 constituting a lighting system according to the invention. As mentioned above, this lighting system comprises two front projectors, the second projector also comprising five lighting modules according to the invention. According to an exemplary embodiment, each of these modules comprises three light sources spaced from each other immediately adjacent 1 .5 times the width L of a light source, the overlap between two modules being equal to half a width of the light source. first light band. This front projector 23 thus houses a first lighting module 1, a second lighting module 24, a third lighting module 25, a fourth lighting module 37 and a fifth lighting module 38. The relative provision of these modules is special. Indeed, the first, third and fifth lighting modules 1, 25, 38 are included in the same first row containing the plane referenced 39. The second and fourth lighting modules 24, 37 are themselves included in a second row containing the plane referenced 40, distinct from the first row.

According to a vertical axis and in a position of use of the front projector 23, the second plane 40 may be located above the first plane 39, as shown in FIG. 5. Alternatively, the second plane 40 may be located below the first plane 40. plan 39.

In this vertical axis, the second lighting module 24 overlaps the first and third lighting modules 1, 25, while the fourth lighting module 37 overlaps the second and fifth lighting modules 25, 38. As in FIG. In the case of FIG. 3, such a structure makes it possible to limit the parallax defects for a headlamp comprising five lighting modules.

The front projector 23 further comprises a lighting means 41 involved in the production of a code beam.

The front projector may also include an additional lighting device for providing a light beam with a longer range, particularly useful for driving on a motorway, including a beam type highway code (or "motorway light" in English).

The front projector may also include an additional lighting device for providing an additional beam to the beam ADB.

One of the lighting modules, for example the first lighting module 1 according to the invention, can be completed by at least one additional lighting means 5 for forming an edge beam adjacent to the resulting lighting beam. . Such an edge beam gives width to the resulting light beam and thus illuminates the side of the road taken by the vehicle.

A first additional lighting means is installed in the front projector 23 and is arranged to form a first edge light beam, for example, quarter-elliptical, which abuts the extreme light strip of the illumination beam. resulting, referenced 16 in Figure 3 in particular. Of course, the other front projector also comprises additional lighting means arranged to form a second edge-shaped, for example, quarter-elliptical light beam which abuts an extreme light strip of the beam generated by the plurality of beams. modules implanted in this front projector. The quarter-elliptical beam can for example be made according to the teaching of the French patent application, published under the number FR2963662.

In the above description, the light sources employed generate a light beam in the form of a rectangular strip. The invention also covers the use of a light emitter generating a diffuse beam in the path of which is installed a cache comprising a slot which delimits a residual beam shaped rectangular strip. In such a case, a slot is provided

25 by light emitter. The invention also covers the case where each light source is an image of a light emitter by an optical element, for example a light guide. In this case, the light source takes the form of a rectangle-shaped light segment on the exit surface of said light guide.

Claims

1. Lighting module (1, 24, 25, 37, 38) for headlight (23) of a motor vehicle capable of generating a light beam (7) of optical axis (2), 5 comprising at least a first light source (8) and a second light source (9) spaced from one another by a distance (D), said light sources (8, 9) being capable of each generating a light strip (5, 6) spaced the one from the other by an unilluminated strip (1 1) by the lighting module, said light sources (8, 9) being defined by the same dimension (L) measured perpendicular to the optical axis (2) , characterized by the fact that the distance (D) between two immediately adjacent light sources (8, 9) is strictly greater than N ^* (L) and strictly less than (N+1) ^* (L), N being an integer .

15 2. Module according to claim 1, in which the distance (D) between two immediately adjacent light sources (8, 9) is strictly greater than (N+0.25) ^* (L) and strictly less than (N+0 .75) ^* (L).

3. Module according to claim 2, in which the distance (D) between two immediately adjacent light sources (8, 9) is equal to (N + 0.5) ^* (L).

4. Module according to one of the preceding claims, characterized in that an angular width of the unilluminated strip (1 1) is equal to 1.5 times the width of one of the light strips (5, 6).

25

5. Module according to any one of the preceding claims, in which there is provided a reflection means (13) and a projection device (14) common to said light sources (8, 9) which participate in the formation of a first band light (5) generated by the first light source (8) and

30 the formation of a second light band (6) generated by the second light source (9).

6. Module according to claim 5, in which the reflection means (13) takes the form of a single reflector which reflects a first light beam (3) generating the first light strip (5) and a second light beam (4 ) generator of the second light strip (6).

5

7. Module according to claim 6, in which the projection device (14) is formed by a single focusing device which focuses the first light beam (3) and the second light beam (4). î o

8. Module according to any one of the preceding claims, in which the light sources (8, 9) are light-emitting diodes.

9. Module according to any one of the preceding claims, comprising an odd number of light sources (8, 9, 12).

15

10. Headlight (23) for a motor vehicle comprising at least one lighting module (1, 24, 25, 37, 38) according to any one of the preceding claims.

11. Projector according to claim 10, comprising an odd number of lighting modules (1, 24, 25, 37, 38) greater than one.

12. Projector according to claim 1 1, comprising three lighting modules (1, 24, 25).

25

13. Projector according to any one of claims 1 1 or 12, comprising at least a first lighting module (1), a second lighting module (24) and a third lighting module (25), the second lighting module (24) being arranged in the projector (23) so as to generate

30 secondary light bands (26, 27, 28) angularly offset relative to the primary light bands (5, 6, 16) generated by the first lighting module (1), the third lighting module (25) being arranged in THE projector (23) so as to generate tertiary light bands (29, 30, 31) angularly offset relative to the primary and secondary light bands.

14. Projector according to claim 13, in which the angular offset between the first lighting module (1) and the second lighting module (24), and between the second lighting module (24) and the third module d The lighting (25), is equal to ½ width of a light strip (5) generated by the first lighting module (1), measured perpendicular to the optical axis (2).

15. Projector according to any one of claims 13 or 14, in which the first lighting module (1) and the third lighting module (25) are part of a first plane (39), the second module d The lighting (24) is part of a second plane (40) distinct from the first plane (39).

16. Projector according to any one of claims 1 1 to 15, comprising five lighting modules (1, 24, 25, 37, 38).

17. Headlight according to any one of claims 10 to 16, in which the lighting modules (1, 24, 25, 37, 38) participate in the formation of a road light beam.

18. Lighting system for a motor vehicle comprising a first projector and a second projector according to any one of claims 10 to 17, the first projector projecting a first network (33) of light bands generated by a plurality of lighting modules (1, 24, 25, 37, 38), the second projector projecting a second network (34) of light strips generated by a plurality of lighting modules (1, 24, 25, 37, 38), the plurality of modules lighting of the second projector being arranged so as to offset in a horizontal plane the second network (34) of light strips relative to the first network (33) of light strips of a quarter of the width of the first light strip (5) generated by a first lighting module (1) installed in the first projector, measured in the horizontal plane.